Airbnb Gradle Flavors

build.gradle

...
apply from: './flavors.gradle'
...
android {
    buildTypes {
        productFlavors {
            project.flavors.each { flavor, config ->
                "$flavor" {
                    dimension 'scope'
                    if (flavor != 'full') {
                        versionNameSuffix ".$flavor"
                    }
                }
            }
        }
    }
}
...

flavors.gradle

class FlavorOptions {
  final String entryModule

  FlavorOptions(String entryModule) {
    this.entryModule = entryModule
  }
}

project.ext.flavors = [
    full: new FlavorOptions(":flavor.full"),
    foo: new FlavorOptions(":flavor.foo")
]

Been trying to piece these snippets together along with this talk, but I still have a few questions:

1. Are the feature flavors application or library modules?

I keep running into build errors when they're com.android.application modules. Specifically:

Execution failed for task ':app:processFlavorDebugResources'.
A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade

Error goes away when I change the module to a com.android.library.

2. Noticed your response on your Medium article.

This snippet adds the entry module as a dependency of the root app module:

project.flavors.each { flavor, config ->
    project.dependencies.add("${flavor}Compile", project(config.entryModule))
}

I assume the snippet above goes in the app/build.gradle file?

3. What actually lives in a flavor module?

From your response to this, each flavor has its own Application class. And from Ben's talk, a LauncherActivity and some UI configurations. Am I missing anything else? Does each flavor gradle file also perform some flavor configuration or does that solely live in app/build.gradle?

A detailed example of this set up would be greatly beneficial.

@ivanalvarado Hi Ivan, unfortunately, I don't work at Airbnb anymore and don't have access to the latest code. Every time I work with gradle, it requires a lot of trial and error and Googling (you are not alone) so I won't be able to provide more specific code either.

I belive this code was at the project level app.gradle file though and flavors are used for application modules.